| 摘要 |
PROBLEM TO BE SOLVED: To provide a foldable cylindrical safety fence easy to set, remove and carry. SOLUTION: This safety fence is divided into four parts (segments) 15 when seen from above, and these parts are mutually connected in a cylindrical shape by pins 19. The connecting pin 19 can be pulled out in the connection part between the first segment 15a and the fourth segment 15d so that the fence can be cut off in this part. This fence is lifted by a crane by hooking a sling on eyepieces 33 provided on a top rail 5, and set on a working hole 35. A base frame 1 in the lower part of the safety fence has an insert part 11 smaller in diameter than the body part, and this part is fitted into a temporary easing 37 to prevent the slippage. In the transport or storage of the safety fence, the part between the first and fourth segments 15a and 15d is cut, and the segments are successively folded with the first segment 15c as the center so as to roll it.
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